Add container registry observations to usage ping

changelogs/unreleased/199193-track-total-number-of-instances-using-an-external-container-regist.yml

+---
+title: Add container registry observations to usage ping
+merge_request: 37203
+author:
+type: added

doc/development/telemetry/usage_ping.md

@@ -737,6 +737,8 @@ appear to be associated to any of the services running, since they all appear to
 | `server`                                                  | `topology > nodes > node_services`   | `enablement`  |                  |         | The type of web server used (Unicorn or Puma)                              |
 | `network_policy_forwards`                                 | `counts`                             | `defend`      |                  | EE      | Cumulative count of forwarded packets by Container Network                 |
 | `network_policy_drops`                                    | `counts`                             | `defend`      |                  | EE      | Cumulative count of dropped packets by Container Network                   |
+| `vendor`                                                  | `container_registry`                 | `package`     |                  | CE+EE   | The Container Registry vendor (GitLab or third-party)                      |
+| `version`                                                 | `container_registry`                 | `package`     |                  | CE+EE   | The Container Registry version (only when vendor is GitLab)                |
 
 ## Example Usage Ping payload
 
@@ -811,6 +813,10 @@ The following is example content of the Usage Ping payload.
     "enabled": true,
     "version": "1.17.0"
   },
+  "container_registry": {
+    "vendor": "gitlab",
+    "version": "2.9.1-gitlab"
+  },
   "database": {
     "adapter": "postgresql",
     "version": "9.6.15"

lib/gitlab/usage_data.rb

@@ -254,6 +254,10 @@ module Gitlab
             enabled: alt_usage_data(fallback: nil) { Gitlab.config.pages.enabled },
             version: alt_usage_data { Gitlab::Pages::VERSION }
           },
+          container_registry: {
+            vendor: alt_usage_data(fallback: nil) { Gitlab::CurrentSettings.container_registry_vendor },
+            version: alt_usage_data(fallback: nil) { Gitlab::CurrentSettings.container_registry_version }
+          },
           database: {
             adapter: alt_usage_data { Gitlab::Database.adapter_name },
             version: alt_usage_data { Gitlab::Database.version }

spec/lib/gitlab/usage_data_spec.rb

@@ -575,6 +575,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
 
       it 'gathers basic components usage data' do
         stub_runtime(:puma)
+        stub_application_setting(container_registry_vendor: 'gitlab', container_registry_version: 'x.y.z')
 
         expect(subject[:app_server][:type]).to eq('puma')
         expect(subject[:gitlab_pages][:enabled]).to eq(Gitlab.config.pages.enabled)
@@ -587,6 +588,8 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
         expect(subject[:gitaly][:clusters]).to be >= 0
         expect(subject[:gitaly][:filesystems]).to be_an(Array)
         expect(subject[:gitaly][:filesystems].first).to be_a(String)
+        expect(subject[:container_registry][:vendor]).to eq('gitlab')
+        expect(subject[:container_registry][:version]).to eq('x.y.z')
       end
 
       def stub_runtime(runtime)